Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B60—VEHICLES IN GENERAL
  • B60S—SERVICING, CLEANING, REPAIRING, SUPPORTING, LIFTING, OR MANOEUVRING OF VEHICLES, NOT OTHERWISE PROVIDED FOR
  • B60S1/00—Cleaning of vehicles
  • B60S1/02—Cleaning windscreens, windows or optical devices
  • B60S1/04—Wipers or the like, e.g. scrapers
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21D39/00—Application of procedures in order to connect objects or parts, e.g. coating with sheet metal otherwise than by plating; Tube expanders
  • B21D39/04—Application of procedures in order to connect objects or parts, e.g. coating with sheet metal otherwise than by plating; Tube expanders of tubes with tubes; of tubes with rods
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B60—VEHICLES IN GENERAL
  • B60S—SERVICING, CLEANING, REPAIRING, SUPPORTING, LIFTING, OR MANOEUVRING OF VEHICLES, NOT OTHERWISE PROVIDED FOR
  • B60S1/00—Cleaning of vehicles
  • B60S1/02—Cleaning windscreens, windows or optical devices
  • B60S1/04—Wipers or the like, e.g. scrapers
  • B60S1/0413—Modular wiper assembly
  • B60S1/0422—Modular wiper assembly having a separate transverse element
  • B60S1/0425—Modular wiper assembly having a separate transverse element characterised by the attachment of the wiper shaft holders to the transverse element
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T29/00—Metal working
  • Y10T29/49—Method of mechanical manufacture
  • Y10T29/49826—Assembling or joining
  • Y10T29/49908—Joining by deforming
  • Y10T29/49925—Inward deformation of aperture or hollow body wall
  • Y10T29/49927—Hollow body is axially joined cup or tube
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T403/00—Joints and connections
  • Y10T403/46—Rod end to transverse side of member
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T403/00—Joints and connections
  • Y10T403/49—Member deformed in situ
  • Y10T403/4966—Deformation occurs simultaneously with assembly

Definitions

• the invention relates to a molded part with a pin for connection to a tube, the pin having a plurality of troughs arranged in the direction of its longitudinal axis.
• the invention is applicable in the field of joining technology, in particular in the field of vehicle technology and there on windshield wiper systems.
• Each wiper bearing is equipped with a pin which is fastened in a support designed as a tube.
• the tube connects the wiper bearing to the wiper motor.
• the pipe is fastened to the spigot by plastic deformation of the pipe, which is also called crimping. The crimping ensures that forces and moments can be transmitted between the pin and the tube.
• a windshield wiper system with a tubular support is known, which is attached to an extension or pin of a wiper bearing.
• the pin has four trough-shaped recesses transverse to its longitudinal axis on, two of which are opposite each other.
• Carrier material is pressed into the recesses with a stamp which is complementary to the trough shape and touches the pin in the entire recessed area.
• connection between the pin and the tube is released during the transmission of force or torque. This can be the case especially with large temperature changes. Temperatures from -40 ° C to + 120 ° C can occur.
• the connection can also be released when the windshield wiper system is operated for a long time or when the wipers are blocked, for example by snow and ice. Loosening the connection between the spigot and the pipe leads to a strong noise when operating the wiper system, which is not acceptable.
• the invention is therefore based on the problem of providing a molded part with a pin which overcomes the disadvantages mentioned above.
• a loosening of the connection between the spigot and the pipe should be prevented, even under extreme conditions.
• the problem is solved in a molded part with a pin for connection to a tube, the pin having a plurality of troughs arranged in the direction of its longitudinal axis, in that two adjacent troughs are each separated from one another by two lugs which extend transversely to the longitudinal axis of the pin .
• FEM calculation of the known solution described above has shown that the type and degree of deformation has a great influence on instabilities of the crimping.
• complete plasticization is not achieved in some areas. This leads to high residual stresses after tool relief. These stresses build up to compressive stresses and lead to an unstable stress state in the pipe section under external loads and additionally cause a shape deviation from the nominal contour.
• the contact surfaces between the pin and the pipe are not sufficiently developed and can lead to a loosening of the connection.
• the separation of the troughs by the lugs according to the invention has the effect that before the tool is relieved, compressive stresses are enclosed by tensile stresses which are greater in amount than the compressive stresses.
• These stress differences and distributions due to the trough geometry are advantageous because the stresses reverse after the tool is relieved. This means that the tensile stresses are converted into compressive stresses, ie towards the interior of the trough, and the compressive stresses, ie away from the core.
• the larger tensile stresses counteract the enclosed compressive stresses and result in a good homogeneous compressive stress distribution on the core. This results in stable crimping in the trough area.
• a special embodiment of the invention is characterized in that the lugs each have two nostrils which, starting from the edges of the troughs, are initially concave and then convexly curved.
• the concave / convex transitions between the troughs counteract axial loads. The result of these transitions is that the pipe material "claws" around the pin. This effect is caused by opposite compressive stresses in the concave areas. A stable state of equilibrium is achieved through the convex transitions.
• a further special embodiment of the invention is characterized in that the pin has at least three troughs, and in the middle of the three troughs there is an everting pull in the longitudinal direction of the pin.
• the pull-in pull ensures better consolidation of the central trough and thus enables a homogenization of the stress distribution in the soil. As a result, the floor area does not lift off the tenon after the tool has been relieved.
• Another special embodiment of the invention is characterized in that a catch hole is arranged in the vicinity of the pin. An exact positioning of the pin to the die of the tool is achieved through the catch hole. This ensures a satisfactory deformation of the tube.
• Another special embodiment of the invention is characterized in that the troughs are arranged on opposite sides of the pin circumference. As a result, a particularly secure fit of the tube on the pin is advantageously achieved.
• the teaching of the present invention also includes a
• a method of connecting the previously described molded part with a pipe which is characterized by the following steps: the pipe is pushed over the pin, the pipe with the pin is in a double-acting
• the tool inserted with two stamps, the tool is closed so that it surrounds the tube, the pin being fixed relative to the tool by the catch hole, the two punches move together, the tube is plastically deformed, encloses the pin and assumes the geometry of the pin or the punch in the region of the forming zone.
• the technical advantage of connecting a pipe to a peg produced by this method is that an almost stress-free state of equilibrium is established in the pipe. This means that there is no unstable voltage state due to external loads, which leads to an undesired loosening of the connection.
• the solution according to the invention leads to sufficient plasticization, i.e. a good material flow and at the same time a good consolidation is achieved. This ensures sufficient contact zones and a stable state of tension after the tool is relieved.
• Figure 1 shows a perspective view of a molded part according to the invention.
• the molded part designated 1 is a bushing Windshield wiper system, not shown.
• a cylindrical pin 2 is formed on the molded part 1 and serves to receive a tube (not shown).
• One end of the tube is attached to the pin 2 by crimping.
• the crimping serves to transmit forces between the molded part or the pin and the pipe.
• the other end of the tube is connected to a support element, not shown, on which the wiper motor is attached.
• troughs 3, 4 and 5 are formed in the pin 2.
• the troughs 3, 4 and 5 are separated from one another by lugs 6.
• Two noses 6 are located opposite each other between two adjacent troughs.
• a free space 10 is cut out between two opposing lugs 6.
• the free spaces 10 connect the troughs 3, 4 and 5 to one another.
• the lugs 6 extend from the edge of the troughs transversely to the longitudinal axis of the pin 2.
• Each lug has two opposite lugs 7, which are curved concavely.
• the nostrils 7 merge into a tip 8 of the nose, which is convexly curved.
• a pull pull 9 is formed parallel to the longitudinal axis of the pin 2.
• the slip pull 9 extends between the free spaces 10 and has approximately the same height as the lugs 6.
• a molded part 1 according to the invention To connect a molded part 1 according to the invention to a tube by crimping, either the pin 2 of the molded part 1 is inserted into the end of the tube or the end of the tube is pushed onto the pin 2 of the molded part 1 until a plug-in depth of the pin 2 corresponding to the requirements is reached.
• the required insertion depth of the pin 2 can be defined, for example, by a stop ring 11 provided on the molded part 1 be, which then strikes at the end of the tube.
• the tube with the pin 2 is inserted into a double-acting tool, not shown, with two punches. In a first stage, the tool closes so that the pipe is enclosed by the tool.
• the fixation of the pin 2 in the tool is achieved by a catch hole 12 which is made in the vicinity of the stop ring 11 in the molded part 1.
• the catch hole 12 ensures an exact positioning of the stamps relative to the pin 2, which is crucial for the quality of the crimping.
• the two punches of the tool move together from opposite directions.
• the tube is plastically deformed and takes on the geometry of the pin 2 or the punch in the region of the forming zone.
• the contour of the stamp is complementary to the contour of the pin 2.
• the solution according to the invention can be transferred to any pin or pipe diameter.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Insertion Pins And Rivets (AREA)
• Shafts, Cranks, Connecting Bars, And Related Bearings (AREA)

Priority Applications (3)

Applications Claiming Priority (2)

Publications (1)

Family

ID=7842101

Family Applications (1)

Country Status (5)

Cited By (2)

Families Citing this family (6)

Citations (7)

Family Cites Families (4)

• 1997
  • 1997-09-12 DE DE19740067A patent/DE19740067A1/de not_active Withdrawn
• 1998
  • 1998-09-14 DE DE59810638T patent/DE59810638D1/de not_active Expired - Lifetime
  • 1998-09-14 EP EP98950030A patent/EP1012013B1/de not_active Expired - Lifetime
  • 1998-09-14 US US09/508,143 patent/US6353991B1/en not_active Expired - Lifetime
  • 1998-09-14 ES ES98950030T patent/ES2210830T3/es not_active Expired - Lifetime
  • 1998-09-14 WO PCT/EP1998/005824 patent/WO1999014086A1/de active IP Right Grant

Patent Citations (7)

Also Published As

Similar Documents

Legal Events